摘要
故障电流和故障电压的准确计算是复合光缆地线系统热稳定校验和地线绝缘间隙选择的基础。为此建立基于相参数法的计算模型,研究一段有限长的线路,针对线路单相对地短路故障,考虑地线和相导线之间的互感的影响,利用仿真软件定量讨论了当线路在不同地点发生故障时,OPGW上的暂态电流和电压的幅值、持续时间和影响范围。结果表明:OPGW上的暂态电流峰值和暂态电压峰值分别为稳态电流峰值和稳态电压峰值的1.3～1.7倍和1.1～1.6倍;暂态过程持续0.04～0.08s;故障点两侧约8km内出现较大的暂态电流和暂态电压。
Accurate calculation of fault current and fault voltage is the foundation of thermo-stabilization verification of compound optical ground wire and selection of the insulating gap of the ground wire. We established a phase-coordinate model of a finite length power line considering the mutual inductance between phase wires and ground wires, then simulated the transient current and the transient voltage process on the OPGW when the single phase to ground wire fault occurs at several different places. Results show that the peak value of the transient current is 1.3 - 1.7 times the steady current, and the peak value of the transient voltage is 1.1-1.6 times the steady voltage; the transient process lasts for 0.04-0.08 s; there is a quite big transient current and transient voltage value within the distance of 8km to the fault point.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第10期2481-2485,共5页
High Voltage Engineering
基金
国家自然科学基金(20777038)~~
关键词
复合光缆地线(OPGW)
故障电流
暂态电流
暂态电压
电力系统
相参数法
compound optical ground wire（OPGW）
fault current
transient current
transient voltage
power system
phase-coordinate model
